India, June 24 -- What was first believed to be a tragic trekking accident has now unravelled into an alleged murder conspiracy involving a young woman and her boyfriend, just months before her wedding.

Five days after Pune businessman Ketan Vishal Agarwal's death at Lohagad Fort was recorded as an accidental fall, police arrested his fiancee, Siya Goyal, 20, and her alleged boyfriend, Chetan Chaudhary, 22. Investigators claim the two conspired to push Agarwal into a 400-foot gorge with the intention of killing him.

The arrests have also cast a spotlight on warning signs that Ketan's family now believes were overlooked, including the 25-year-old's concerns about Goyal's behaviour, her frequent phone use and her apparent closeness to ano...